CVE-2024-0743: Mozilla Firefox

High severity, CVSS 7.5. EPSS: 1.3% chance of exploitation in the next 30 days.

An unchecked return value in TLS handshake code could have caused a potentially exploitable crash. This vulnerability affects Firefox < 122, Firefox ESR < 115.9, and Thunderbird < 115.9.

Affected products

• Mozilla Firefox: before 122.0 (fixed in 122.0)

Published 2024-01-23. Last modified 2026-06-17.